Key Caboratory of Chinese Ministry of Education of northwest Water Resource and Environmental ecolog School of environmental and Municipal Engineering 声建墨群骨 xi'an University of Architecture and Technology Establishment of a water quality matrix A water quality matrix is established based on the analytic results abovementioned using a 2 X 2 classifying method by Pollutant size: dissolved, suspended (row) Chemical property: organic, inorganic(column) such forming 4 classifications of pollutants in domestic wastewater Dissolved organic matter(D-o Suspended organic matter(S-o) Dissolved inorganic matter(D-1) Suspended inorganic matter(S-1)Key Laboratory of Chinese Ministry of Education of Northwest Water Resource and Environmental Ecology School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology